By Jonny Turner Craig Ferguson knows the first few metres of the Group 3 events on Macca Lodge Northern Southland Cup Day could be as crucial as the last. Ferguson links up with two key chances in Validation in the Caduceus Club Of Southland Alabar Fillies Classic and Wag Star in the Macca Lodge Northern Southland Cup. Validation is the only filly in her field of youngsters to have been to the races ahead of Sunday’s Group 3. The Ross Houghton trained two-year-old led early from barrier 1 in her…